Under this heading must be distinguished (1) secular tithes, which subjects on crown-estates were obliged to pay to princes, or tenants, or vassals on leased lands or lands held in fief to their landlords (decimæ origine laicales), and (2) ecclesiasticaltithes, which in the course of time became alienated from the Church to lay proprietors (decimæ ex post laicales s. sæcularizatæ). There is question here only of the latter. In the secularizations initiated under the Merovingians the transference of ecclesiastical property and their tithes or of the tithes alone to laymen was effected. In subsequent times church lands with their tithes, or the tithes alone, were bestowed even by bishops and abbots on laymen to secure servants, vassals, protectors against violence and defenders of their civil rights. Other church property with tithes, or the tithes alone, were forcibly seized by laymen. Finally, the development of churches, once the property of private individuals, into parish churches subject to the bishop gave rise to the landlord appropriating the tithes due to the parish church. The church soon took measures to repress this spoliation, beginning as early as the ninth century at the Synod of Diedenhofen (844; cap. iii, 5) and that of Beauvais (845; cap. iii, 6). Gregory VII revived in a stricter form these old canons at the Autumn Synod of 1078, demanding that the laity should return all tithes to the Church, even though they had been given them by bishops, kings, or other persons, and declared all who refused obedience to be sacrilegi (C. 1, C. XVI, q. 7). Succeeding popes and synods repeated this order, declaring that Church tithes to be iuris divini (C. 14, X, de decim., III, 30); that, as the inalienable source of income of the parish church, they could not be transferred to another church or monastery (C. 30, X, de decim., III,30); that they could not be acquired by a layman through prescription or inheritance, or otherwise alienated.

But it was quite impossible for the Church to recover the tithes possessed for centuries by laymen, to whom in fact they had been in many cases transferred by the Church itself. Laymen gave then, in preference to the monastery instead of the parish church, but this became thenceforth subject to the approval of the bishop (C. 3, X, do privil., III 33). The decision of the Lateran Council (1179), forbidding the alienation of the church tithes possessed by the laity, and demanding their return to the Church (C. 19, X. de decim., III, 30) was interpreted to mean that, those ecclesiasticaltithes, which up to the time of this council were in possession of laymen, might be retained by them, but no further transference should take place (C. 25, X, de decim., III, 30, c. 2, A in Vito, h.t., III, 13). But even this could not be carried out. There thus existed side by side with church tithes a quantity of lay tithes; the latter were dealt with by secular courts as being purely secular rights, while ecclesiastical law was applied to ecclesiasticaltithes. However, certain of the obligations imposed by the (once) ecclesiasticaltithes continued to bind the proprietor, even though he were a layman. Thus in the case of church buildings the Council of Trent declared that patrons and all "qui fructus aliquos ex dictis ecclesiis provenientes percipiunt" were bound secondarily to defray the cost of repair (Sess. XXI, De ref., c. vii; see FABRICA ECCLESIÆ). When there is a doubt as to whether the tithes in question are ecclesiatical or lay, the reasonable presumption is that they are ecclesiastical.

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